/Engine/Source/Runtime/SlateCore/Public/Styling/SlateColor.h
A Slate color can be a directly specified value, or the color can be pulled from a WidgetStyle.
struct FSlateColor
ESlateColorStyl...
ColorUseRule
The rule for which color to pick.
FLinearColor
SpecifiedColor
The current specified color; only meaningful when ColorToUse == UseColor_Specified.